Great Dick,
I`m glad you have had good luck with your 1.7 as I recall you have always been pretty good tuning Motors

On the Battery, I would normally get 4-5 flights with the(2100)MHA Batteryon the CDI, But I have switched to the 2600.LI, that Central Hobbies now sells. same weightand size, and I can now get 8 flights safely.

Ahmed,
I`m not sure I follow your questions perfecly, but I will PM you the Trim directions for the Valiant that I wrote to go in the build instructions.
if it goes to the canopy on any manuever , your c/g is too far forward causing you to use some up trim. and effecting you nuetral ballance. depending on the weight you might have a slight pull out on the downlines only.

I would Also Like more details on you air filter ,very Clever!!
Bryan